feat: bump minimum python version to 3.9 (3.8 is EOL)

Author: Elan456

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.8"
+          python-version: "3.9"
 
       - name: Create venv for maturin develop
         run: python -m venv .venv

pyproject.toml

@@ -8,7 +8,7 @@ name = "fastquadtree"
 dynamic = ["version"]
 description = "Rust-accelerated quadtree for Python with fast inserts, range queries, and k-NN search."
 readme = { file = "README.md", content-type = "text/markdown" }
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [] # No runtime dependencies
 license = { file = "LICENSE" }
 authors = [{ name = "Ethan Anderson" }]